Functional resumes are good when you have little to zero work experience (or new grads). This type of resume allows you to showcase skills that fit in with the job requirements. Fair warning: most recruiters and hiring managers dont like this format and feel as though you may be hiding something. If you have a chronological resume you do not want to have one part chronological and one part functional because it will throw off the entire formatting and may confuse the employer about your skill set.
How much does it cost to create a resume? It may cost you nothing if you can do it on your own. However writing this specific type of document requires competent writing skills. Moreover just your writing skills will not suffice. The document must provide appropriate and adequate details about your skills and achievements in an attractive and comprehensive manner. The content and the presentation of the resume are of equal importance.
Mass production may be suitable for nuts and bolts; however it sure is not the right method to create your resume. This is what the resume mills or factories do - produce resumes that all look the same. When a prospective employer receives hundreds of applications and your resume is similar to the majority of them the impression created is not good enough to warrant an interview. Most likely it will not even be viewed.